I have a HA installation with a USB EZSP Silicon Labs router.
For several days an unknown device appears, it seems to be a Hue light but all of my Hue lights are present with other devices. When I delete it, it reappears the next day at the latest. Switching it “off” just results in an error.
IIRC, Hue devices not paired with a coordinator will stay in pairing mode forever.
ZHA itself doesn’t, though. Are you suggesting the device reappears even when ZHA in not in pairing mode?